Evaporator for refrigerators



June 13, 1933- A. E. SCHNEIDER EVAPQRATOR FOR REFRIGERATORS 1929 2 Sheets-Sheet 1 Filed June 26 June 13 1933a ZEEWOSMT/C' SWITCH SucWa/v 4mm A. E. SCHNEHDER EVAPORATOR FOR REFRIGERATORS Filed June 26, 1929 2 Sheets-Sheet 2 INVENTOR 5;, BY V64:

Patented June 13, 1933 PATENT OFFICE ALBERT E. SCHNEIDER, OF OMAHA, NEBRASKA EVAPOBATOR FOR REFRIGERATORS Application filed June 26,

This invention relates to a cooling or evaporating unit for refrigerators, the general object of the invention being to make the unit of two cylinders spaced apart and having their ends closed so that a refrigerant can be circulated through the space between the two cylinders and thus cool articles or material placed in the inner cylinders.

Another object of the invention is to corrugate the cylinders so as to increase the strength and cooling surface area.

A further object of the invention is to connect a plurality of the units together so that the refrigerant will circulate from one to another and thus cool the entire series.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a front view showing the invention used as a refrigerator for cooling water or the like, placed in trays.

Figure 2 is a longitudinal sectional view through the unit shown in Figure 1.

Figure 3 is a section on line 33 of Figure 2.

Figure 4 is a sectional view showing a plurality of units connected together.

Figure 5 is an enlarged sectional view through a unit.

As shown in these views, each unit A is composed. of an outer cylinder 1 and an inner cylinder 2 slightly spaced apart to form the annular space 3 between them, the ends of the space being closed, as shown at 4, by connecting the ends of the cylinders together.

The cylinders are of corrugated form, as

1929. Serial No. 373,836.

shown, which increases their strength and also increases the cooling surface area.

The refrigerant is introduced into the space 3 through the inlet 5 and passes from the space through the outlet 6.

Figures 1, 2 and 3 show the device in horizontal position, with a casing 7 therein to receive the articles or material to be cooled, such material being preferably placed in trays or drawers 8 which are slidably supported in the casing. The device is held in a box 9 by the brackets 10, though the device can be supported in any other manner, if desired.

Figure 4 shows a plurality of devices arranged vertically and connected together in series at their upper ends by the tubular connections 11. The liquid enters the first device through the pipe 12 which is provided with an expansion valve 13 or any other form of valve and after filling the space 3 of said first device, it overflows into the second device through the connection 11 and so on until the spaces of the devices are filled. The space of the last device is connected with the suction line by the pipe 14 which contains the thermostatic bulb 15 with which is associated the usual thermostatic switch 16. Thus the liquid level is controlled by the thermostat when using S0 refrigerant. As the oil always remains on top, such oil will readily return to the compressor.

WVhen the device is used as in Figures 1, 2 and 3, the rear end is closed by a plate 17 so as to produce a low temperature for the freezing of the ice cubes. When the device is used in a commercial installation, such as meat counters and coolers, the device is placed in a vertical position with its ends open so that air can circulate through the device and contact the inside and outside walls thereof and thus cool the chamber in which it is placed. The device can also be used as an ice cream cabinet, and in this case, the device would be placed in a vertical position with its bottom closed and the ice cream container placed therein.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is A plurality of refrigerant units each including two parallel cylinders spaced apart, a closing strip for each end of the space formed between the cylinders, and inlet and outlet pipes located at the tops of the units and in alignment with each other for placing the spaces of the cylinders in communication with each other, whereby oil contained within refrigerant and floating on the surface thereof will be the first to pass from one unit to another and back to a compressor to prevent trapping of said oil within the units and pipes.

In testimony whereof I aflix my signature.

ALBERT E. SCHNEIDER. 

